228818772 has 72 divisors (see below), whose sum is σ = 711890816. Its totient is φ = 60346944.

The previous prime is 228818771. The next prime is 228818773. The reversal of 228818772 is 277818822.

It is an interprime number because it is at equal distance from previous prime (228818771) and next prime (228818773).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228818771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31648 + ... + 38199.

Almost surely, 2^228818772 is an apocalyptic number.

It is an amenable number.

228818772 is an abundant number, since it is smaller than the sum of its proper divisors (483072044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228818772 is a wasteful number, since it uses less digits than its factorization.

228818772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69877 (or 69872 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 228818772 is about 15126.7568235891. The cubic root of 228818772 is about 611.6418832708.

Subtracting 228818772 from its reverse (277818822), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 228818772 in words is "two hundred twenty-eight million, eight hundred eighteen thousand, seven hundred seventy-two".